Correct. If you see uploads occurring in your monitor window, then you must still have the files somewhere. Otherwise, you would see the message 'file not found' whenever someone tries to download a file that you just deleted.
The easiest way to access files is this: go into your Limewire library and find the file in question. Select it and click 'Explore' in bottom left of screen. The folder that contains the file will now open.
If you can't find the file that way, try using your computer's search function.
By the way, what do you mean you can't preview files? I would recommend disabling the Limewire player if you have not done so. Tools...options...player and uncheck 'Use Limewire Player'. Then, all of your previews will be shown on the default player for that type of file. Try
VLC player if you like...it's free and will play most file types. If you still are having no luck, you can always try going into your 'incomplete' folder and manually opening files from there. Not all files are easily previewed, as you may not download it in order. But, if you use Bitzi as WW suggested, there will be little reason for you to preview files (unless you have dial-up and it takes a long time to DL a video).
Best of luck
Dano